Polishing-head.



William:

1?. PIERCE.

POLISHING HEAD.

APPLICATION FILED MAY23,190B.

Patented Nov. 24, 1908.

(Il /wanton [id/21 Pierce.

UTTE STATES PATENT FRANK PIERCE, OF RUTLAND, VERMONT, ASSIGNOR TO'llllil LINUOLN IRON WORKS, OF RUTLAND, VERMONT, A CORPORATION OFVERMONT.

POLISHING-HEAD.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed May 23, 1908. Serial No. 434,589.

To all whom it may concern:

Be it known that I, FRANK PIERCE, a citizen of the United States,residing at Rutland county of Rutland and State of Vermont, haveinvented certain new and useful Improvements in Polishing-Heads, ofwhich the following is a specification, reference behad therein to theaccompanying drawing.

This invention relates to a polishing head, and particularly to astructure adapted for use upon stone and similar surfaces.

The invention has for an object to provide a novel and improvedconstruction of head provided with projections adapted to enter a spacewithin an abrasive block secured to said head.

Another object of the invention is to provide means for balancing thehead when it becomes worn more upon one side than the other andcomprises an adjustable plate mounted upon the block carrying plate.

A further object of the invention is to provide a clutch connectionbetween the adjustable plate and head whereby these parts may beseparated as desired or when connected will engage and drive the blockplate drawing the same into tightly locked position.

Other and further objects and advantages of the invention will behereinafter fully set forth and the novel features thereof defined bythe appended claims.

In the drawing :Figure 1 is a top plan; Fig. 2 is a side elevationthereof; Fig. 3 is a bottom plan; Fig. l is a vertical section on theline 4 it, Fig. 1; Fig. 5 is a detail perspective of the head, and Fig.6 is a similar view of the adjustable plate.

Like numerals refer to like parts in the several views of the drawing.

The numeral 10 designates the supporting plate for the abrading blockswhich is provided upon its under face with a series of projections 11disposed concentric to the center or axis of the plate, and preferablyformed of angular outline, for instance. hexagonal. These projectionsare adapted to fit an interior opening in the abrading or grindingblocks 12, and these blocks may be formed of carborundum, alundum, emeryor other suitable abrasive material and are cemented to the plate 10 bythe use of cement of any preferred character. The plate 10 is here shownas circular in configuration,

but may be of any desired form or material. The central opening 13 inthe blocks 12 has angularly disposed walls corresponding with those ofthe projections 11 and also preferably extcndcd for greater length so asto provide pockets l-t disposed adjacent the outer periphery of theplate 10 and adapted to hold liquid and allow a clearance space for theaction. of the grinding blocks.

The upper face of the plate 10 is without projections and slidinglymounted thereon is the balancing plate 15 which is provided with aseries of securing apertures 16 through which a holding bolt 17 extendsand is of less diameter than the diameter of the aperture to permit afree adj ustment of the balancing plate. The belt 17 passes through thewasher 1S and is threaded into the plate 10 so as to clamp the balancingplate in adjusted position. This balancing plate is also provided with aplurality of clutch jaws 19 upon its upper face each having inclinedcontact faces 20 adapted to cooperate with similar faces 21 carried bythe lugs 22 disposed within the head 23 which is suitably recessed forthat purpose so as to produce in ell'ect a bayonet joint connection.This head is also provided with the usual pivoting lugs 2i by which itis supported from the polishing machine.

From the foregoing description it will be seen that the abrading blocksare supported by the projections from the under face of the plate andare mounted thereon so as to firmly hold them in position concentric tothe axis of the head and permit their use without danger or possibilitof a metallic part coming in contact with the surface to be polished andthus injuring the same. The angular form of this projection fitting intothe abradii'lg blocks also resists any rotary movement of the blocks andholds them firmly against CllS]')l lCGn10llt in such position as toprovide the usual channels leading radially from the axis of the headbetween adjacent blocks. While the balancing plate and detachable headhave been herein shown and described in connection with abrading blocksthey are adapted for application to any desired character of surfacinghead or plate for either polishing. grinding, or but ing action upon thematerial treated and are not confined to any particular character ofwork. The balancing plate permits the head to be adjusted when itbecomes more worn on one side than the other and eonsequenth out ofbalance the plates may be readily shifted and secured so that therelation of the head to the center of the surfacing plate may be varied.The connection with this head by means of the clutch jaws permits theready removal and replacement of the surfacing plate so that differentgrades or characters of surfacing material may be applied and usedwithout delay as found desirable 'n finishing to different degrees thestone or other material being treated. The inclined faces upon these awsride upon each other and drive the lower plate also permitting thelifting of the same by raising the machine spindle as it forms apositive locked connection bet-ween these parts.

Having described my invention and set forth its merits, what I claim anddesire to secure by Letters Patent is 1. A surfacing head comprising aplate havin a series of angular projections upon its under face disposedconcentric of its axis, and abrading blocks having interior recesseswith angular faces to engage and embrace the walls of said projections.

2. A surfacing head comprising a plate having a series of projectionsupon its under face disposed concentric of its axis, and abrading blockshaving interior recesses adapted to lit the w lls of said projectionsand provide a pocket adjacent to some of the walls of the projections.

A surfacing head comprising a plate, a series of angular projectionsupon the under face thereof, and abrading blocks having interiorrecesses of different angular form from the projections but adapted toengage a plurality of the walls thereof.

4:. In a surfacing head, a plate having surfacing means upon the underface tl ereof, a balancing plate mounted upon the upper su face, anoperating head connected to sa 1 balancing plate, and mea--s foradjusting the balancing plate upon the surfacing 5. In a surfacing head,a plate having surfacing means upon the under face thereof, a

balancing plate mounted upon the upper surface, a head connected to saidbalancing plate, and a screw extended through an enlarged aperture inthe balancing plate and into said sin-facing plate.

head, a plate having surfacing means upon the under face thereof, a baaucing plate mounted upon the upper sur- In a surfacing race, heat.connected to said balancing plate, a screw extended through an enlargedaperture in the balancing plate and into said sin-racing alate, clutchjaws provided upon the upper face of the balancing plate, and coengagingbeneath the members carried by said e.

9. surfacing head, plate provided with surfacin means upon its underface, a ead for sup rting and rotating said plate, and means foradjusting said head laterally of said plate.

6. in a surfacing heao, a plate provided surfacing means upon its underface, a ..d for supporting and rotating said plate, 21562111. foradjusting said head laterally of said Jlate, and means for det-achablyconn i said head and plate.

in testimony whereof I affix my signature in presence of two witnesses.

RANK PEERCE.

ll itnesses P. il ADAMS, ilowano Woonrm.

